Power cables are used for transmitting and distributing electrical energy. They are commonly employed in urban underground power grids, transmission lines from power stations, internal power supply for industrial and mining enterprises, and underwater transmission lines across rivers.
Key Advantages of Power Cables:
1. Minimal land requirement: Generally buried underground or laid indoors, in trenches, tunnels, with small inter-space insulation distances, no need for towers, occupying little land, and hardly using any above-ground space.
2. High Reliability: Minimal impact from climate and surrounding environmental conditions, stable transmission performance, and high reliability.
3. Favored conditions for development towards higher pressure and larger capacity, such as low-temperature, superconducting power cables, etc.
4. Larger distributed capacitance.
5. Low maintenance workload;
6. Low risk of electric shock.

Electrical cables: To ensure the normal operation of the cables and motors, the following three principles should be adhered to when selecting the cable cross-section:
1. During normal operation, the actual temperature rise of the cable should not exceed the maximum allowable temperature rise for the insulation.
2. Select based on the allowable voltage loss during cable line operation.
3. The selection of cable cross-section must meet the requirements for mechanical strength.
Basic Structure of Power Cables:
The basic structure of power cables consists of four parts: the core (conductor), insulation layer, shielding layer, and protective sheath.
1. Core wire. The core wire is the conductive part of power cables, used for transmitting electrical energy and is the main component of power cables.
2. Insulation Layer. The insulation layer is essential in electrical cables, as it electrically isolates the core from the ground and between cores of different phases, ensuring the transmission of electrical power. It is an indispensable component of the cable structure.
3. Sheath layer. Power cables with 15KV and above typically have conductor sheath and insulation sheath layers.
4. Protective Layer. The role of the protective layer is to shield the power cable from external impurities and moisture, as well as to prevent direct physical damage to the power cable.

Cable power, categorized by voltage grades:
Low-voltage cables: Suitable for fixed installation in AC 50Hz transmission and distribution lines with rated voltages of 3kV and below for power transmission.
2. Medium and Low Voltage Cables (generally 35KV and below): Polyvinyl Chloride (PVC) insulated cables, Polyethylene (PE) insulated cables, Cross-Linked Polyethylene (XLPE) insulated cables, etc.
3. High-voltage Cables: Typically 110KV and above; polyethylene cables and cross-linked polyethylene insulated cables, etc.
4. Pressurized Cables: (275-800KV)
5. Ultra-high voltage cables: (1000KV and above).
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